An aquarium can house a variety of animal species, including fish, crustaceans, mollusks, and other invertebrates. These inhabitants create a unique ecosystem where each species plays its role, ensuring harmony and beauty in the underwater world.
The choice of animal species for an aquarium depends on the maintenance conditions, tank size, and the owner’s preferences. Fish are the most popular inhabitants, but invertebrates such as shrimp, snails, and starfish are equally interesting, helping maintain cleanliness and balance in the aquarium. Getting acquainted with their characteristics will help create a comfortable environment for all residents.
If you want a comprehensive overview of care, species diversity, and their features, we recommend reading our detailed analysis «Animal in the Aquarium: A Complete Guide to Care, Species, and Characteristics.» In this article, we discuss key representatives of aquarium fauna and provide tips on selecting and caring for them.
| Animal Species | Aquarium Volume (liters) | Temperature (°C) | Price (₽) |
|---|---|---|---|
| Neon Tetra | from 20 | 22–26 | from 150 |
| Goldfish | from 50 | 18–24 | from 300 |
| Guppy | from 20 | 22–26 | from 250 |
| Shrimp Neocaridina davidi | from 10 | 22–28 | from 100 |
| Apple Snail | from 30 | 20–28 | from 250 |
| Marine Shrimp Lysmata amboinensis | from 100 | 24–27 | about 1500 |
- 4 cm Maximum size of neon tetra
- 50 liters Minimum aquarium volume for goldfish
- 22–28 °C Optimal temperature for Neocaridina davidi shrimp
- 20–30% Recommended partial water change in the aquarium
- 300 ₽ Average price of a goldfish in Russian pet stores
Which Fish Species Are Most Commonly Chosen for Home Aquariums and Why?
Popular Freshwater Fish
Neon tetras, goldfish, and guppies are the most sought-after species for home aquariums due to their bright coloration, hardiness, and affordable price. Neon tetras (Paracheirodon innesi) grow up to 4 cm and cost from 150 ₽ each, attracting attention with their vivid blue and red colors.
Goldfish (Carassius auratus) are considered ideal for beginner aquarists, as they can live up to 10 years in aquariums of at least 50 liters, with prices starting from 300 ₽. Guppies (Poecilia reticulata) are popular for their high fertility and easy care, with an average individual price of about 250 ₽.
Care Characteristics
- Neon Tetras: require stable water temperatures around 22–26 °C and good oxygenation, sensitive to sudden parameter changes.
- Goldfish: need spacious aquariums from 50 liters and regular filtration, prone to waste buildup, so frequent water changes are important.
- Guppies: undemanding about water quality, can live within 20–28 °C, reproduce quickly, requiring population control and regular feeding.
Which Invertebrate Animals Can Be Kept in Aquariums and What Conditions Do They Need?
Freshwater Invertebrates
In freshwater aquariums, Neocaridina davidi shrimp and apple snails (Pomacea bridgesii) are popular, each requiring different care conditions. Neocaridina davidi shrimp need water temperatures of 22–28 °C and pH levels of 6.5–7.5, with prices starting at 100 ₽ per individual.
Apple snails help clean the aquarium from algae and leftover food, thriving in tanks from 30 liters in volume. Their cost is approximately from 250 ₽ per snail. Successful care requires stable water parameters and enough space.
Marine Invertebrates
Marine shrimp Lysmata amboinensis require specialized marine aquariums with a volume of at least 100 liters and strictly controlled water parameters. Their price is about 1500 ₽ per individual. These shrimp fit well in reef tanks where they help clean parasites and leftover food.
- Aquarium volume: at least 100 liters
- Price of Lysmata amboinensis shrimp: about 1500 ₽
- Temperature range for freshwater shrimp: 22–28 °C
- pH for Neocaridina davidi: 6.5–7.5
- Minimum volume for apple snails: 30 liters
What Are the Main Water Parameter Requirements for Different Aquarium Animal Species?
Temperature and pH
The main water parameters for aquarium animals include temperature and acidity (pH), which significantly affect their health and activity. For freshwater fish, the optimal temperature is 22–26 °C, and pH should be in the range of 6.5–7.5 to ensure comfortable metabolic conditions and stress prevention. For example, the popular Tetra HT 300 thermometer, costing around 800 ₽, allows precise aquarium temperature control.
Salinity and Hardness
Marine aquarium inhabitants require water salinity around 35 ppt (parts per thousand) and temperatures between 24–27 °C, replicating natural ocean conditions. For freshwater species, water hardness is important — the optimal range is 4–12 dGH. Regular water changes of 20–30% every 1–2 weeks maintain parameter stability and prevent toxin buildup. Salt mixes like Red Sea Marine Salt cost about 1500 ₽ for 5 kg and are used to maintain proper salinity in marine tanks.
What Are the Most Common Restrictions and Mistakes When Keeping Different Aquarium Animal Species?
Stocking Mistakes
Overcrowding the aquarium is one of the most common mistakes, leading to stress and diseases among its inhabitants. It is recommended not to exceed 1 cm of fish length per 1 liter of water to avoid environmental deterioration and excess waste. For example, a 50-liter aquarium should not contain fish with a combined length over 50 cm. For Neocaridina davidi shrimp, maintaining a water pH not below 6.0 is critical; otherwise, mass die-offs occur. Ignoring these parameters is especially dangerous for sensitive invertebrate species, while some snails require stable water hardness levels.
Care Mistakes
Incorrect feeding is a frequent cause of illnesses, especially in goldfish, which need specialized feeds high in protein content. For instance, TetraGold feed costs on average 400–600 ₽ for 250 g and provides balanced nutrition. Additionally, irregular water changes and ignoring parameters (temperature, ammonia, nitrites) lead to deteriorating health of all aquarium inhabitants. To maintain optimal conditions, weekly water changes of 15–20% and tests for pH and hardness control are recommended.
How to Choose an Aquarium Animal Based on Tank Size and Volume?
Small Aquariums
For aquariums up to 30 liters, it is optimal to select small animals with low space and water quality demands. These include neon tetras, which rarely exceed 3–4 cm in length, and Neocaridina davidi shrimp, known for their hardiness and activity. Mini tanks with this volume typically cost between 1500–3500 ₽, making them an affordable choice for beginner aquarists.
When choosing pets, it is important to consider that stocking density should not exceed 1 cm of fish length per 1 liter of water to avoid stress and environmental degradation. Neon tetras thrive in a temperature range of 20–26 °C, which corresponds to most home conditions.
Medium and Large Aquariums
Aquariums from 50 liters allow keeping larger animals such as goldfish, which can grow up to 15 cm in length in nature, and apple snails with shells up to 8 cm in diameter. These volumes typically offer greater water parameter stability, easing care and expanding the variety of available species. Aquariums of such sizes generally start at 5000 ₽.
- Volume 50–100 liters: suitable for goldfish, apple snails;
- Volume over 100 liters: necessary for marine shrimp and large fish like angelfish, which reach 15 cm in length;
- For large fish, a minimum volume of 100 liters is recommended to provide space and environmental quality.
When selecting animals for large aquariums, it is important to consider not only volume but also water parameters — their stability is critical for the health of large and marine species. For example, angelfish require temperatures of 24–28 °C and soft to medium water hardness.
Where Can Aquarium Animals and Equipment Be Purchased in Russia in 2026?
Stores and Prices
In Russia in 2026, aquarium animals and equipment can be purchased both in major chain pet stores and specialized online shops. Chains like «Four Paws» and «Pet Supplies» offer a wide selection of fish and invertebrates priced from 100 to 2000 ₽ per individual, allowing picks for different budgets and preferences.
The online store AquaShop.ru specializes in aquariums ranging from 20 to 300 liters with prices from 1500 to 35000 ₽, making it a convenient choice for those seeking compact models for beginners as well as large systems for experienced aquarists.
Recommended Equipment
To ensure optimal conditions for aquarium animals in 2026, filters like the AquaClear 50 costing about 4500 ₽ and heaters such as the Tetra HT 50, priced around 1500 ₽, are especially recommended. These devices provide quality water filtration and maintain necessary temperatures.
- AquaClear 50 filter — about 4500 ₽;
- Tetra HT 50 heater — about 1500 ₽;
- Aquariums on AquaShop.ru — from 1500 to 35000 ₽;
- Fish and invertebrates at “Four Paws” and “Pet Supplies” — from 100 to 2000 ₽ per individual.
Frequently Asked Questions
Which animals are best suited for beginner aquarists?
Can marine and freshwater animals be kept together?
How often should water be changed in an aquarium with shrimp?
Why are apple snails beneficial for an aquarium?
Key Takeaways
- Neon tetras and guppies are affordable and undemanding freshwater fish.
- Neocaridina davidi shrimp require stable pH 6.5–7.5 and temperatures of 22–28 °C.
- Overcrowding reduces animal survival rates.
- Aquarium volume determines species choice and quantity.
- Quality equipment ensures stable water parameters.